package cyx.example.ddd.infrastructure.order.query;

import cyx.example.ddd.application.order.assembler.OrderAssembler;
import cyx.example.ddd.application.order.dto.OrderDTO;
import cyx.example.ddd.application.order.dto.OrderStatisticsDTO;
import cyx.example.ddd.application.order.query.OrderPageQuery;
import cyx.example.ddd.application.order.query.OrderPageResult;
import cyx.example.ddd.application.order.query.OrderQuery;
import cyx.example.ddd.application.order.query.OrderQueryRepository;
import cyx.example.ddd.domain.order.model.aggregate.Order;
import cyx.example.ddd.domain.order.repository.OrderRepository;
import cyx.example.ddd.infrastructure.order.converter.OrderConverter;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Repository;

import java.math.BigDecimal;
import java.time.LocalDate;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;

/**
 * 订单查询仓储实现
 * 专门处理订单相关的查询操作，实现CQRS模式
 */
@Slf4j
@Repository
@RequiredArgsConstructor
public class OrderQueryRepositoryImpl implements OrderQueryRepository {
    
    private final OrderRepository orderRepository;
    private final OrderAssembler orderAssembler;
    
    @Override
    public Optional<OrderDTO> findById(String orderId) {
        log.debug("查询订单详情，订单ID: {}", orderId);
        return orderRepository.findById(orderId)
                .map(orderAssembler::toDTO);
    }
    
    @Override
    public List<OrderDTO> findByUserId(String userId) {
        log.debug("查询用户订单列表，用户ID: {}", userId);
        return orderRepository.findByUserId(userId).stream()
                .map(orderAssembler::toDTO)
                .collect(Collectors.toList());
    }
    
    @Override
    public List<OrderDTO> findByConditions(OrderQuery query) {
        log.debug("根据条件查询订单列表，查询条件: {}", query);
        
        // 这里应该实现复杂的查询逻辑
        // 为了简化，我们暂时返回所有订单，然后进行过滤
        List<Order> allOrders = orderRepository.findByUserId(""); // 临时方案
        
        return allOrders.stream()
                .filter(order -> filterByConditions(order, query))
                .map(orderAssembler::toDTO)
                .collect(Collectors.toList());
    }
    
    @Override
    public OrderPageResult findByPage(OrderPageQuery pageQuery) {
        log.debug("分页查询订单列表，页码: {}, 每页大小: {}", pageQuery.getPage(), pageQuery.getSize());
        
        // 这里应该实现分页查询逻辑
        // 为了简化，我们暂时返回空结果
        OrderPageResult result = new OrderPageResult();
        result.setOrders(List.of());
        result.setTotalElements(0L);
        result.setTotalPages(0);
        result.setCurrentPage(pageQuery.getPage());
        result.setPageSize(pageQuery.getSize());
        result.setHasNext(false);
        result.setHasPrevious(false);
        
        return result;
    }
    
    @Override
    public OrderStatisticsDTO getStatistics(LocalDate startDate, LocalDate endDate) {
        log.debug("获取订单统计信息，开始日期: {}, 结束日期: {}", startDate, endDate);
        
        // 这里应该实现统计查询逻辑
        // 为了简化，我们暂时返回模拟数据
        OrderStatisticsDTO statistics = new OrderStatisticsDTO();
        statistics.setTotalOrders(100L);
        statistics.setTotalAmount(new BigDecimal("10000.00"));
        statistics.setAverageAmount(new BigDecimal("100.00"));
        
        // 模拟状态统计
        Map<String, Long> statusCount = new HashMap<>();
        statusCount.put("CREATED", 20L);
        statusCount.put("PAID", 30L);
        statusCount.put("CONFIRMED", 25L);
        statusCount.put("SHIPPING", 15L);
        statusCount.put("COMPLETED", 10L);
        statistics.setStatusCount(statusCount);
        
        // 模拟货币统计
        Map<String, Long> currencyCount = new HashMap<>();
        currencyCount.put("CNY", 80L);
        currencyCount.put("USD", 20L);
        statistics.setCurrencyCount(currencyCount);
        
        Map<String, BigDecimal> currencyAmount = new HashMap<>();
        currencyAmount.put("CNY", new BigDecimal("8000.00"));
        currencyAmount.put("USD", new BigDecimal("2000.00"));
        statistics.setCurrencyAmount(currencyAmount);
        
        return statistics;
    }
    
    /**
     * 根据查询条件过滤订单
     */
    private boolean filterByConditions(Order order, OrderQuery query) {
        // 实现查询条件过滤逻辑
        // 这里只是示例实现
        if (query.getUserIds() != null && !query.getUserIds().isEmpty()) {
            if (!query.getUserIds().contains(order.getUserId())) {
                return false;
            }
        }
        
        if (query.getStatuses() != null && !query.getStatuses().isEmpty()) {
            if (!query.getStatuses().contains(order.getStatus())) {
                return false;
            }
        }
        
        if (query.getCurrency() != null) {
            if (!query.getCurrency().equals(order.getCurrency())) {
                return false;
            }
        }
        
        if (query.getMinAmount() != null) {
            if (order.getTotalAmount().getAmount().doubleValue() < query.getMinAmount()) {
                return false;
            }
        }
        
        if (query.getMaxAmount() != null) {
            if (order.getTotalAmount().getAmount().doubleValue() > query.getMaxAmount()) {
                return false;
            }
        }
        
        return true;
    }
} 